JPH10339115A - Valve opening/closing timing controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a device in such a way that displacement converting actuation (relative rotation of a rotary shaft and a rotation transmitting member) is started after lock release by move of a lock pin is performed. SOLUTION: In the condition where a lock pin 70 gets out of a receiving hole 22 to retract in a retraction hole 32, a first fluid passage 24 and a third fluid passage 23 communicate with each other through the receiving hole 22 and the retraction hole 32, so in the condition where 6 head part of the lock pin 70 is engaged in the receiving hole 22, pressure fluid is supplied through the third fluid passage 23 to the receiving hole 22 to move the lock pin 70 against spring energization force, and that in the condition where the lock pin 70 is out of the receiving hole 22 to retract in the retraction hole 32, pressure fluid is supplied from the third fluid passage 23 to the first fluid passage 24 through the receiving hole 22 and the retraction hole 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing control device for controlling the timing of opening or closing an intake valve or an exhaust valve in a valve train of an internal combustion engine.

[0002]

2. Description of the Related Art As one type of valve opening / closing timing control device of this type, a valve opening / closing rotary shaft (a camshaft and an internal rotor integrally provided therewith) which is rotatably mounted on a cylinder head of an internal combustion engine. Formed between the rotation shaft and the rotation transmission member, the rotation transmission member being externally rotatably rotatable within a predetermined range and transmitting rotation power from a crankshaft, a vane attached to the rotation shaft, and the rotation transmission member. A fluid pressure chamber divided into an advance chamber and a retard chamber by the vane, a first fluid passage for supplying and discharging fluid to the advance chamber, and a fluid supply and exhaust to the retard chamber. A second fluid passage, a retraction hole formed in the rotation transmitting member and accommodating therein a lock pin spring-biased toward the rotation shaft, a rotation hole formed in the rotation shaft, and the rotation transmission member. Are synchronized in a predetermined phase Some of the lock pins have a receiving hole into which the head of the lock pin is fitted, and a third fluid passage for supplying and discharging a fluid to and from the receiving hole. It is disclosed in the gazette.

[0003]

In the valve timing control devices disclosed in the above publications, the lock pin is opposed to the spring biasing force by the pressure fluid supplied to the receiving hole through the third fluid passage. And a structure in which the lock by the lock pin is released by moving and the supply and discharge of the fluid to and from the first fluid passage and the second fluid passage are simultaneously performed. Therefore, the displacement conversion operation (relative rotation between the rotation shaft and the rotation transmission member) may start before the lock is released by the movement of the lock pin. In this case, excessive friction occurs between the lock pin and the receiving hole. However, the lock may not be released accurately by moving the lock pin.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to address the above-mentioned problems, and has a valve opening / closing rotary shaft rotatably mounted on a cylinder head of an internal combustion engine.
A rotation transmission member which is provided to be rotatable relative to the rotation shaft within a predetermined range and to which rotation power from a crankshaft is transmitted, a vane attached to one of the rotation shaft or the rotation transmission member, the rotation shaft and the rotation shaft; A fluid pressure chamber formed between the rotation transmitting member and divided into an advance chamber and a retard chamber by the vane, and a fluid (either hydraulic oil or pressurized air) is supplied to the advance chamber. A first fluid passage for discharging, a second fluid passage for supplying and discharging fluid to and from the retard chamber, and a spring formed in the rotation transmitting member or the rotation shaft and directed toward the rotation shaft or the rotation transmission member therein. A retracting hole for accommodating the biased lock pin, and the head of the lock pin is formed when the relative phase of the rotation shaft and the rotation transmission member formed on the rotation shaft or the rotation transmission member is synchronized with a predetermined phase. The receiving hole to be inserted and this receiving hole A third fluid passage for supplying and discharging a fluid, wherein the first fluid passage or the second fluid passage is used for controlling the opening / closing timing of an intake valve or an exhaust valve of an internal combustion engine. The first fluid passage or the second fluid passage and the third fluid passage are connected to the receiving hole in a state where the lock pin comes out of the receiving hole and is retracted in the retracting hole by communicating with the retreat hole. It is characterized in that it is configured to communicate through the evacuation hole.

[0005]

In the valve timing control device according to the present invention, the first fluid passage or the second fluid passage and the third fluid passage receive the lock pin in a state where the lock pin comes out of the receiving hole and retreats to the evacuation hole. When the head of the lock pin is fitted into the receiving hole, pressurized fluid is supplied to the receiving hole through the third fluid passage so that the lock pin resists the spring biasing force. Then, in a state where the lock pin comes out of the receiving hole and retreats to the evacuation hole, the pressure fluid is supplied from the third fluid passage to the first fluid passage or the second fluid passage through the receiving hole and the evacuation hole. Therefore, after the lock is released by the movement of the lock pin, the displacement conversion operation (relative rotation of the rotation shaft and the rotation transmission member) is performed.
Is started, and there is no problem that the unlocking of the lock pin is hindered by the displacement conversion operation.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The valve opening / closing timing control device according to the present invention shown in FIGS. 1 to 6 is integrated with a camshaft 10 rotatably supported by a cylinder head 110 of the internal combustion engine and a tip end thereof (a left end portion in FIG. 1). And a rotary shaft for opening and closing a valve formed of an internal rotor 20 provided on the outer rotor 30, a front plate 40, a rear plate 50, and a rear plate 50 which are externally rotatable relative to the rotary shaft within a predetermined range. Timing sprocket 51 formed
And the like, four vanes 60 attached to the inner rotor 20, a lock pin 70 attached to the outer rotor 30, and the like. As is well known, the timing sprocket 51 is configured to transmit rotational power clockwise in FIG. 3 from a crankshaft (not shown) via a crank sprocket and a timing chain.

[0007] The camshaft 10 is an intake valve (not shown).
The camshaft 10 has a well-known cam (not shown) that opens and closes, and an advance passage 11 and a retard passage 12 that extend in the axial direction of the camshaft 10. The advance passage 11 is shown in FIG.
As shown in (1), it is connected to the connection port 101 of the switching valve 100 via the radial passage 13 and the annular passage 14 provided in the camshaft 10 and the connection passage 111 provided in the cylinder head 110. Also, the retard passage 12 is shown in FIG.
As shown in (1), it is connected to the connection port 102 of the switching valve 100 via the annular passage 15 provided in the camshaft 10 and the connection passage 112 provided in the cylinder head 110.

The switching valve 100 is capable of moving the spool 104 against a spring 105 by energizing the solenoid 103. When the solenoid 103 is not energized, the supply valve 106 is connected to an oil pump P driven by the internal combustion engine. Communicates with the connection port 102,
The connection port 101 is connected to the discharge port 107, and the supply port 106 is connected to the connection port 10 when power is supplied.
1 and the connection port 102 is configured to communicate with the discharge port 107. Therefore, when the solenoid 103 is not energized, hydraulic oil is supplied from the oil pump P to the retard passage 12, and when energized, hydraulic oil is supplied from the oil pump P to the advance passage 11. The suction side and the discharge port 107 of the oil pump P are connected to an oil reservoir T of the internal combustion engine.

The internal rotor 20 has a single mounting bolt 81.
And is integrally fixed to the camshaft 10 by
Each of the four vanes 60 has a vane groove 21 for mounting the vane 60 in the radial direction, and the state shown in FIGS. 1 to 3, that is, the relative phase between the camshaft 10 and the inner rotor 20 and the outer rotor 30 is a predetermined phase. A receiving hole 22 into which the head of the lock pin 70 is inserted by a predetermined amount when synchronized at the (most retarded position), a passage 23 for supplying and discharging hydraulic oil from the advancing passage 11 to the receiving hole 22, and each vane 60. A passage 24 for supplying and discharging hydraulic oil to the advance chamber R1 defined by the vane 60, and a retard passage 1 to the retard chamber R2 defined by each vane 60.
2 has a passage 25 for supplying and discharging hydraulic oil. The receiving hole 22 is formed in the outer circumference of the internal rotor 20 in the radial direction. Note that each vane 60 is urged radially outward by a vane spring 61 (see FIG. 1) housed in the bottom of the vane groove 21.

The outer rotor 30 is mounted on the outer periphery of the inner rotor 20 so as to be relatively rotatable within a predetermined range. A front plate 40 and a rear plate 50 are joined to both sides thereof, and are integrally formed by four connecting bolts 82. Are linked together. In addition, four protrusions 31 are formed on the inner periphery of the outer rotor 30 at predetermined intervals in the circumferential direction so as to protrude radially inward, and the inner peripheral surfaces of these protrusions 31 The outer rotor 30 is rotatably supported by the inner rotor 20 in a configuration in which the outer rotor 30 is in sliding contact with the outer peripheral surface.
1, a retreat hole 32 for accommodating the lock pin 70 and the spring 71 is formed in the radial direction of the external rotor 30, and a communication recess 33 communicating with the inner end of the retreat hole 32 is formed in the circumferential direction. . The communication recess 33 communicates with the passage 24 that supplies and discharges the working oil to the advance chamber R <b> 1 via a recess 41 formed in the front plate 40 and the annular groove 42.

Each vane 60 is mounted between the plates 40 and 50 in the vane groove 21 of the internal rotor 20 so as to be movable in the radial direction, and is slidably abutted on the inner peripheral wall of the external rotor 30 at the tip. The fluid pressure chamber Ro formed between each protrusion 31 of the outer rotor 30 and the inner rotor 20 is divided into an advance oil chamber R1 and a retard oil chamber R2. The phase (relative rotation amount) adjusted by the valve timing control device is limited by contacting the stoppers 31a formed on the rotation direction end surfaces of the upper and lower protrusions 31.

The lock pin 70 is slidably mounted in the evacuation hole 32 in the axial direction, and is urged by the spring 71 toward the internal rotor 20. The spring 71 is interposed between the lock pin 70 and the retainer 72, and the retainer 72 is fixed in the evacuation hole 32 by a clip 73 so as not to come off.

In the valve timing control apparatus of the present embodiment configured as described above, the state shown in FIG. 1, that is, the head of the lock pin 70 is fitted into the receiving hole 22 by a predetermined amount.
In the locked state where the relative rotation between the inner rotor 20 and the outer rotor 30 is restricted at the most retarded position, the solenoid 103 of the switching valve 100 is energized, and the solenoid valve 103 is moved from the switching valve 100 to the advance passage 11 of the camshaft 10. When the hydraulic oil is supplied, the hydraulic oil is supplied to the receiving hole 22 through the passage 23, and the lock pin 70 moves against the spring 71, and
2 and retracted to the evacuation hole 32 (see FIGS. 2 and 3), the passage 23 passes through the receiving hole 22, the evacuation hole 32, the communication recess 33, the recess 41, the annular groove 42, and the passage 24 to advance each angle. Hydraulic oil is supplied to the oil chamber R1, and hydraulic oil is discharged from each retarding oil chamber R2 through each passage 25, the retard passage 12, the switching valve 100, and the like, as shown in FIGS. The rotation shaft such as the internal rotor 20 relatively rotates to the advance side with respect to the rotation transmission member such as the external rotor 30.

Therefore, in the present embodiment, after the lock is released by the movement of the lock pin 70 against the spring 71, the displacement conversion operation (the relative rotation of the rotation transmitting member such as the internal rotor 20 and the external rotor 30). ) Starts, and the lock pin 70
There is no problem that the lock release is hindered. 5 and 6, when the solenoid 103 of the switching valve 100 is de-energized and hydraulic oil is supplied from the switching valve 100 to the retard passage 12 of the camshaft 10, the retard passage 12 Hydraulic oil is supplied to the retard oil chambers R2 through the passages 25 through the passages 25, and the advance oil chambers R1 and the passages
Hydraulic oil is discharged through the annular groove 42, the concave portion 41, the communication concave portion 33, the evacuation hole 32, the receiving hole 22, the passage 23, the advance passage 11, the switching valve 100, and the like. The rotation relative to the constant rotation transmission member is retarded. At this time, the passage 2
The lock pin 70 is pushed against the spring 71 by the hydraulic oil flowing through the lock 3, and is retained in the retracted hole 32.

In the above embodiment, the rear plate 5
0 is provided integrally with the outer periphery of the outer rotor 30, and the timing sprocket 51 is integrally provided on the outer periphery of the external rotor 30 to transmit rotational power from the crankshaft via the crank sprocket and the timing chain. A pulley is integrally provided (it is also possible to form a separate member and be integrally fixed), and the present invention can be similarly applied to a device in which rotational power is transmitted from a crankshaft via a crank pulley and a timing pulley. It is.

In the above embodiment, the lock pin 70 mounted on the external rotor 30 in a state where the advance oil chamber R1 has the minimum volume (the most retarded state shown in FIGS. 1 to 4).
Is configured to fit into the receiving hole 22 of the inner rotor 20, but the outer rotor 30 is attached to the outer rotor 30 in a state where the retarding oil chamber R2 has the minimum volume (the most advanced state shown in FIG. 6). The head of the assembled lock pin 70 is inserted into the receiving hole 2 of the internal rotor 20.
2, it is also possible to implement. In this case, it is necessary that the passage 23 communicates with the retard passage 12 and the passage 23 communicates with the passage 25 through the receiving hole 22, the evacuation hole 32, the communication recess 33, the recess 41, and the annular groove 42. 24 must be communicated directly with the advance passage 11.

In the above embodiment, the present invention is applied to the valve opening / closing timing control device mounted on the camshaft 10 for the intake valve. However, the present invention is applied to the valve opening / closing device mounted on the camshaft for the exhaust valve. The timing control device can be similarly implemented. In the above embodiment, the vane 70 is attached to the inner rotor 20 and the lock pin 70 and the spring 71 are housed in the outer rotor 30. However, the lock pin and the spring are housed in the inner rotor, and the outer rotor is housed in the outer rotor 30. It is also possible to carry out by attaching a vane.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a valve timing control apparatus according to the present invention.

FIG. 2 is a longitudinal sectional side view showing a state where the lock pin shown in FIG. 1 is retracted into a retract hole.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is an end view taken along line 4-4 in FIG. 2;

5 is an end view showing a state in which a rotation shaft such as an internal rotor is relatively rotated by a predetermined amount with respect to a rotation transmitting member such as an external rotor from the state shown in FIG. 4;

6 is an end view showing a state in which the rotation shaft of the internal rotor and the like is rotated relative to the rotation transmitting member such as the external rotor by a maximum amount from the state of FIG. 4;

[Explanation of symbols]

Reference Signs List 10 camshaft, 20 internal rotor, 22 receiving hole, 23 passage (third fluid passage), 24 passage (first fluid passage), 25 passage (second fluid passage), 30 outer rotor, 32 evacuation hole, 33 communication recess, 40 front plate, 41 recess, 42 annular groove, 50 rear plate, 51 timing sprocket, 60 vane,
Reference numeral 70: lock pin, 71: spring, 100: switching valve, 110: cylinder head, Ro: working chamber (fluid pressure chamber), R1: advance oil chamber (advance chamber), R2: retard oil chamber (Room for retard angle).

Claims (1)

[Claims] 1. A rotary shaft for opening and closing a valve rotatably mounted on a cylinder head of an internal combustion engine, and a rotation transmission for transmitting rotation power from a crankshaft which is externally rotatably mounted on the rotary shaft within a predetermined range. A member, a vane attached to one of the rotating shaft or the rotation transmitting member, and a vane formed between the rotating shaft and the rotation transmitting member, divided into an advance chamber and a retard chamber by the vane. A fluid pressure chamber, a first fluid passage for supplying and discharging the fluid to the advance chamber, a second fluid passage for supplying and discharging the fluid to the retard chamber, and the rotation transmission member or the rotation shaft. An evacuation hole for accommodating therein a lock pin spring-biased toward the rotation shaft or the rotation transmission member, and a relative phase between the rotation shaft and the rotation transmission member formed in the rotation shaft or the rotation transmission member. Before is synchronized with the specified phase A receiving hole in which the head of the lock pin is fitted, and a third fluid passage for supplying and discharging fluid to and from the receiving hole are used to control the opening / closing timing of an intake valve or an exhaust valve of the internal combustion engine. The first fluid passage or the second fluid passage communicates with the evacuation hole, and the first fluid flows in a state in which the lock pin comes out of the receiving hole and retreats to the evacuation hole. Aisle or second
A valve timing control device, wherein the fluid passage and the third fluid passage communicate with each other through the receiving hole and the retreat hole.